Electric cable system



March 14, 1939.

B /ENTOR l m I www@ ATTORNEYS Patented Mar. 14, 1939 PATENT OFFICEELECTRIC CABLE SYSTEM Charles E. Bennett, Ridgewood, N. J., assignor toThe Okonite-Callender Cable Company, Incorporated, Paterson, N. J., acorporation of New Jersey Original application December 7, 1935, SerialN0.

53,344, now Patent No. 2,066,322, dated January 5, 1937. Divided andthis application August 13, 1936, Serial No. 95,822

I Claim.

This invention relates to electric distribution systems particularlywell adapted for use in connection with the distribution of power forstreet lighting, house lighting and other domestic or commercial loads.In accordance with my invention the cable conductors and thetransformers for the system are installed in a pipe line adapted tobe'buried in the ground, the pipe line being filled with an insulatingfluid such as oil in which the insulated conductors and trans# formersare immersed at all times, the transformers being immersed in the sameoil as the conductors. Improved means are provided for dissipating theheat generated in the system,

having particular reference to the heat generated by electric losses inthe transformers. 'I'his insures best operating conditions at all times.

This application isa division of my copending application Serial No.53,344, filed December 7,

1935, (Patent No? 2,666,322, dated January 5,

In the accompanying drawing:

Fig. i is an elevational view, more or less diagrammatic, of my improvedsystem; and

Fig. 2 is a part sectional elevational view of part of Fig. 1.

Referring to the drawing in detail, the cable conductors 2 andtransformers 3 of my improved system are mounted within the pipe line Iand are immersed in a suitable fluid, such as oil 4,

with which the pipe line is lled, the trans-4 formers being immersed inthe same fluid as the cable conductors. This fluid is maintained undersuperatmospheric static pressure sufficiently high to increase itsdielectric strength, for example, a pressure of five atmospheresminimum.

Extending vertically from the upper side of the pipe line at eachtransformer 3 is a pipe 5, the lower end of the pipe being incommunication with the interior of the pipe line. This pipe extendsabove the ground in which a cooling tower 6 which may be mounted, forexample, on the surface of the ground, a pipe l the upper end ofwhichfterminates short of the upper end 45 of the pipe 5 extending fromthe tower downwardly to the underside of the pipe line where it entersthe pipe line as shown at 8. This construction, as will be appreciated,provides for a thermal siphon movement of the fluid 4 upwardly in thepipe 5 to spill over into the tower 6, the relatively cooled fluidreturning to the pipe at 8 through the pipe l.

To facilitate cooling of the fluid in the tower 6, the tower is providedwith an outer tube 9 which loosely surrounds the tower and is providedadjacent its top with air outlets I0. As will be appreciated thisprovides for a circulation of air past and in contact with the tower, asindicated by the arrows on the drawing.

From all of the foregoing it will be seen that the present inventionprovides a distribution system in which the conductors and transformersof the system are enclosed in a pipe line containing oil or othersuitable insulating fluid in which the cable conductors and transformersare immersed, the transformers being immersed in the same fluid as theconductors, means being provided for permitting of movement of theinsulating fluid away from the transformers so as to dissipate the heatgenerated by the electric losses in the transformers.

What I claim isz- A buried electric distribution system comprising incombination a pipe line, insulated cable conductors in the pipe line, atransformer in the pipe line electrically connected to said conductors,an insulating fiuid in the pipe line in which said conductors and.transformer are immersed, a pipe communicating with the pipe line at apoint above the transformer and extending upwardly therefrom, anabove-ground tower with which said pipe communicates, a sleeve aboutsaid tower and spaced therefrom to provide for forced circulation of airabout the tower, and a pipe leading from said tower to the pipe linebelow the transformer, thereby to provide for the circulation of theinsulating fluid from the pipe line adjacent the transformer throughsaid tower for cooling and back to the pipe line adjacent thetransformer.

CHARLES E. BENNETT.

